The title of this video is very short and to the point. If you want to make money online in the stock market, and be your own boss, you will need to know what stocks to buy. With all that being said, these sorts of broad statements can tend to distort the reality of the matter.
Trading vs. Investing: https://claytrader.com/videos/trading-101-trading-vs-investing/
What is Shorting / Going Short: https://claytrader.com/videos/shorting-going-short/